Princess Catherine and Prince William celebrate even as she battles cancer [Video]

As Princess Catherine continues to be treated for cancer, she and Prince William are also celebrating their 13th wedding anniversary.

With a never-before-seen photo from their wedding day, William and Catherine shared the black and white image on Instagram with the caption, “13 years ago today.”

On April 29, 2011, the world watched in awe has the beloved William and his college sweetheart Kate Middleton said I do to forever.

Thirteen years later, the couple has welcomed three children into the world and endured the ups and downs of life on the public stage.

As Catherine revealed in March, she was diagnosed with an undisclosed form of cancer that was found after she underwent serious abdominal surgery earlier this year.

In her statement shared on Instagram, the princess called the diagnosis “a huge shock,” adding that “tests after the operation found cancer had been present. My medical team therefore advised that I should undergo a …